Cabinet Painting Prep: Degreasing, Sanding, and Priming

Quick answer: how to prep cabinets for painting

Prep cabinets in order: remove and label the doors and hardware, degrease every surface, sand or scuff for adhesion, fill dents, dust thoroughly, then prime with the right primer for your cabinet material. Prep is roughly 80 percent of a cabinet job, and skipping any step is what causes a finish to peel within a year.

Key Takeaways

• Prep is about 80 percent of a cabinet job and the single biggest reason a finish lasts or peels.
• Degrease first. Cabinets carry an invisible cooking film that paint cannot bond to.
• Sand or scuff to create tooth. A slick factory surface gives paint nothing to grip.
• Prime with a primer matched to the surface; a bonding primer is mandatory on laminate.
• Skip a real primer in favour of paint-and-primer-in-one, and the finish risks early failure.

Everyone focuses on the paint colour. The part that actually decides whether your cabinets still look good in a decade is the prep. Unglamorous, most of the labour, and exactly where DIY jobs and cheap quotes cut corners. Below, the degrease-sand-prime sequence we run on every condo kitchen, and the shortcuts that cause finish failures. For the full process and pricing, start with our condo kitchen and cabinet painting guide.

Why prep is 80 percent of a cabinet job

Cabinets are the most demanding painted surface in your home. They get opened, touched, splashed, slammed, and wiped down hundreds of times a year. The finish only lasts if the bond underneath is near-perfect, which is a different bar than wall paint has to clear. Walls forgive a lot of things. Cabinets don't.

The painting itself is quick. The work is getting the surface ready: clean enough, rough enough, and primed enough that the enamel locks down and stays. When a cabinet finish fails inside a year, it's almost never the paint. It's a skipped or rushed prep step. Treat the prep as the job and the painting as the last hour of work, and you'll be in good shape.

Step 1: Degrease everything

This step gets skipped more than any other, and it's why I'm putting it first. Every kitchen cabinet, even ones that look clean to you, carries an invisible film of cooking grease. Years of frying onions, simmering pasta water, opening the oven door, it all leaves a thin haze across every surface, heaviest above the stove and around the range hood. Paint physically cannot bond to that grease film. It bonds to the grease instead of the cabinet, and the grease bonds to nothing, and a year later the door starts peeling. I've taken old finishes off cabinets the owner swore had been "wiped down" before the previous paint job, and you can see the grease stain on the underside of the failed paint. It's a real thing.

The right degreaser for the job

A proper degreaser cuts through and lifts that film, followed by a clean rinse with plain water and a full dry. The rinse is critical: residual TSP or detergent on the surface interferes with primer adhesion just as much as the original grease would. The grease is not obvious to the eye, which is why this step gets underestimated and skipped. It cannot be skipped on any cabinet, and matters even more on laminate, which is already slick.

Step 2: Sand or scuff for adhesion

Sanding creates the tooth that lets primer grip. A smooth or glossy factory finish gives paint nothing to hold onto, so the surface has to be roughened, not stripped, just lightly opened up.

The right grit by substrate

The grit numbers come from the Coated Abrasives Manufacturers' Institute (CAMI) standard scale; outside North America the FEPA P-scale is roughly equivalent (P150 ≈ 120 CAMI, P220 ≈ 220 CAMI). A sanding sponge is better than block paper on door profiles. It conforms to raised panel edges and routed details where flat paper misses corners.

After sanding, fill any dents or gouges, sand those smooth, and dust everything thoroughly so no grit interferes with the primer. If you are not sure what your cabinets are made of, our laminate vs wood guide explains how the sanding differs and why it matters.

Can you use liquid deglosser instead of sanding?

Liquid sandpaper (chemical deglosser) is a real product that softens a glossy finish so primer can adhere. It works on most water-based and lacquer finishes but does not work on oil-based paint or pre-catalyzed lacquers. Those substrates still require physical sanding. Deglosser also does not flatten irregularities (dents, scratches, raised grain), so for any cabinet that needs the surface itself improved, sanding is still required.

The honest assessment: liquid deglosser is acceptable as a supplement to scuff-sanding (apply, wipe, then 220-grit pass), but not as a replacement. Every cabinet job we do uses physical sanding for the substrate work; deglosser shows up occasionally on intricate door profiles where physical sanding misses the corners.

Filling oak grain for a smooth finish

Oak and other open-grain woods (ash, mahogany) require an extra step to look smooth after painting: the grain pores need to be filled. Skip this and the painted oak doors will show the grain texture through the finish, which is the visual signature that reads as "painted oak" and undercuts the modern look most owners want.

The fill technique: apply DAP Premium Wood Filler or an equivalent paste filler against the grain with a putty knife, working it deep into the pores. Let it dry (2-4 hours), then sand smooth with 120 grit, then 220 grit. One coat is usually enough on standard oak; deeply grained doors sometimes need a second pass. The fill is more labour but is the difference between a paint job that reads as "oak with paint on it" and a paint job that reads as "smooth painted door."

Step 3: Prime with the right primer

Prime with a primer matched to your surface: a quality cabinet or all-purpose primer on wood, and a specialty bonding primer on laminate or thermofoil. On wood, the primer gives the enamel a sound base and blocks tannin bleed that could discolour a light topcoat. On laminate, a bonding primer is mandatory, because ordinary primer will not grip a slick surface and the finish will peel.

The primer also delivers even coverage on a big colour change or over stained wood. Benjamin Moore recommends a high-hiding all-purpose primer with their Advance enamel and warns against lacquer-based primers that can impede adhesion. This is never the step to skip or economise on, because it is the layer that actually bonds your finish to the cabinet.

Should you trust paint-and-primer-in-one?

No, not for cabinets. Paint-and-primer products are fine on already-painted walls in good shape, but cabinets need a true primer doing a specific job: bonding to a slick surface, blocking tannins, or covering a strong colour change. A dedicated bonding or high-hiding primer does that far more reliably than a combination product.

On a surface that gets handled and wiped daily, the small time saved by skipping a real primer is not worth a finish that fails early. Proper priming as its own step is a big part of why a professional cabinet job lasts a decade or more. Once the prep is done right, the application method, whether sprayed or brushed, matters far less than people think.

Specific products we use at each prep stage

The prep sequence sounds straightforward, but the products matter. The ones we reach for on every condo cabinet job:

Degreaser. Krud Kutter Original Concentrated Cleaner or TSP Heavy Duty Cleaner. Both cut kitchen grease reliably and rinse clean. We avoid pure dish soap, which leaves residue, and we avoid acetone, which lifts laminate surfaces. A 50/50 dilution with warm water, applied with a microfibre cloth, two passes per surface, then a clean-water rinse pass. On heavily soiled cabinets near a high-use stove, we sometimes do three degrease passes before sanding.

Sandpaper. 120-grit aluminium oxide for wood (first cut), 180-grit for the smoothing pass. On laminate or thermofoil, 220-grit for the scuff sand only; coarser grits cut through the laminate face. We use sanding sponges rather than block paper for door profiles because they conform to raised panel edges and routed details where flat paper misses corners.

Dust extraction. A HEPA-filtered shop vacuum attached directly to the sander. Hand-sanding without dust extraction leaves a film of dust that interferes with primer adhesion; the vacuum keeps the surface dust-free as the sanding happens, which is what allows the primer to bond cleanly without an extra cleaning step.

Bonding primer. Stix Waterborne Bonding Primer (Insl-X / Benjamin Moore) for most laminate and thermofoil work. The product was specifically formulated for tough-to-paint surfaces and bonds to laminate in our experience better than the older shellac-based products. One full coat, then a light recoat on any areas that need extra build.

All-purpose primer for wood. Benjamin Moore Fresh Start (high-hiding) on wood cabinets. Two coats if covering a strong colour or sealed stain; one coat on new or already-primed wood. Tannin-blocking primers (oil-based or shellac) only when a stain is bleeding through; latex Fresh Start works for most modern cabinet jobs.

Wood filler. DAP Plastic Wood-X for small dents and gouges. Cures quickly and sands cleanly. We avoid the larger-volume drywall-style fillers because they shrink and may not match the cabinet wood's density. For larger gouges (over 5 millimetres deep) we apply in thin layers, letting each layer set before adding the next, rather than filling in one heavy pass that cracks while curing.

The common DIY shortcuts that cause finish failure

We get called in to repaint failed cabinet jobs regularly, and the failures cluster around the same handful of skipped or rushed prep steps:

Skipping the degrease because the cabinets "look clean." The grease film is invisible. We have stripped failed DIY paint off cabinets that the owner swore had been "wiped clean" before painting, and the underside of the failed paint was visibly grease-stained. Degreasing is the most-skipped step and the most common cause of peeling.

Sanding too aggressively on laminate. Cutting through the thin laminate face exposes the particle-board core underneath, which absorbs paint differently than the surrounding laminate and shows as a discoloured patch. The fix once it happens is to skim the area with wood filler before priming, which is more work than the careful scuff would have been.

Using paint-and-primer-in-one over laminate. Almost guaranteed to fail. The combination products are formulated for already-painted walls in good condition, not slick factory surfaces. A bonding primer is the right call on laminate, full stop, and the product call cabinet painting hangs on.

Recoating before the previous coat has cured. The surface feels dry within hours, but the underlying film is still building strength for days. Recoating too soon traps unreacted material under the next coat, producing a soft finish that scratches under fingernail pressure and fails within months. Patience on cure time is what makes a cabinet job last.

Reinstalling hardware before the finish has cured. Hinges and pulls clamped against a finish that is still curing leave imprints in the surface. We wait 24 to 48 hours after the final coat before reinstalling hardware, and we recommend treating cabinets gently for the first week or two after that.

Painting in a humid or dusty room without ventilation. High humidity slows cure dramatically, and ambient dust settles into wet finish, creating a gritty surface that no amount of sanding fully fixes. We control both: dehumidifiers in summer humidity, dust extraction during sanding, sealed work spaces during the spray and coat stages.

How prep changes by cabinet age and material

The same prep sequence runs on every job, but the time spent on each stage changes with the cabinet's age and material.

New solid wood cabinets (under 5 years, premium build). Light grease, sound surface, no colour-change issues. Degrease lightly, scuff-sand for tooth, one coat of all-purpose primer, two coats of enamel. Whole job runs at the fast end of the timeline.

Mid-age wood cabinets (10 to 20 years, mid-range builder cabinets). Heavier grease build-up, some dents and dings, possibly tannin-bleed risk on cherry or oak species. Degrease heavily, fill and sand, one to two coats of primer depending on colour change, two coats of enamel. Mid-timeline.

Old solid wood cabinets (25+ years, oak or maple). Heavy grease, raised grain from years of expansion and contraction, visible wear at touch points. Heavy degrease, careful sanding to flatten the raised grain (sometimes a wood-grain filler step before primer), stain-blocking primer if needed, two coats of enamel. Longest timeline.

Laminate or thermofoil cabinets (any age, often 2000s-2010s builds). The slickest factory surface. Heavy degrease (laminate holds grease tightly), careful scuff-sand (avoid cutting through), bonding primer (Stix), two coats of enamel. The bonding primer is the make-or-break product call here.

Painted cabinets that need a colour change (any age, already in service). Light grease, slight wear, the existing finish provides some tooth. Degrease, scuff-sand the existing finish, spot-prime any worn areas where the previous paint has chipped, two coats of new enamel. Often the fastest prep cycle of any cabinet job.

The right approach for your cabinets comes from inspecting them, not assuming. We confirm the material and condition during the walkthrough and price prep accordingly, since the difference between a quick degrease-and-sand and a full strip-and-skim is several hours of labour per door.

Getting the prep right

The whole finish rests on the prep: degrease so paint can bond, sand so primer can grip, prime so the enamel locks on. Do those three properly and the painting takes care of itself; skip any one and the best enamel in the world will still fail.

Prep is roughly 80 percent of what you are paying for on a cabinet job, and it is the 80 percent the cheaper quotes cut. We use Benjamin Moore Advance over a primer matched to your substrate, with a 5-year warranty on the workmanship. If you want cabinets prepped to last instead of rushed to fail, send some photos. For the full process, cost, and finish options, our condo kitchen and cabinet painting guide covers the rest.